Scholarly journal articles about health and medicine, nursing, audiology, and biology. PubMed includes the MEDLINE database, but has newer content and additional life science journals. PubMed is late 1940s-current.
1940s-current.

PubMed is the National Library of Medicine's (NLM) premier database of scholarly citations covering nearly 4,500 journals published in the U.S. and more than 70 other countries. New citations are added weekly.
PubMed is more current than MEDLINE via EBSCO and in addition to providing access to MEDLINE, PubMed provides access to:

The out-of-scope citations (e.g., articles on plate tectonics or astrophysics) from certain MEDLINE journals, primarily general science and chemistry journals, for which the life sciences articles are indexed for MEDLINE

Citations that precede the date that a journal was selected for MEDLINE indexing

Some additional life science journals that submit full text to PubMedCentral(c) and receive a qualitative review by NLM.

Over 800 full-text engineering and scientific reference works, handbooks, encyclopedias, reference books, and standards in engineering and chemistry.
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Subject areas include chemistry and plastics, materials science, environmental science, microelectronics materials, electrical engineering, electronic engineering, chemical engineering, systems engineering, food sciences, and mechanical engineering.
Knovel has embedded data with a set of innovative analytical tools to make the data found more productive. The software allows for graph plotters, equation plotters, digitized graphs and other tools to customize data from the available tables.

Current U.S. government-sponsored research and worldwide scientific, technical, engineering, and business-related information.
1964-present.Details -
Terms of Use

Central source for the sale of unclassified and publicly available information from research reports, journal articles, data files, computer programs and audiovisual products from Federal sources. Additionally, information is available from Canada, Japan, the former Soviet Union, Western and Eastern European countries.
Subject Coverage:

Search Chemical Abstracts and the CAS Registry File of over 19 million chemical substances. The CAS RegistrySM in SciFinder and SciFinder Scholar has been enhanced with additional experimental properties from 1920 - 1987 CA records. To use SciFinder for the first time, you must register here: http://rdl.lib.uconn.edu/databases/1908;go

First-time users of SciFinder must register at this site. Once you have registered, you may login into SciFinder using the "SciFinder Scholar" entry in the RDL: http://rdl.lib.uconn.edu/databases/1578;go